i would not put a nv3550 behind a 360/401 engine
even behind a 4.0 engine , the strength of that tranny is marginal

if you really want 5 gears , then the only tranny you should put behind the 360/401 is the nv5600 heavy duty 6 speed .
only the dodge cummins turbo diesel pick-ups came with those tranny`s ( 3500 series )

i would not put a nv3550 behind a 360/401 engine
even behind a 4.0 engine , the strength of that tranny is marginal

if you really want 5 gears , then the only tranny you should put behind the 360/401 is the nv5600 heavy duty 6 speed .
only the dodge cummins turbo diesel pick-ups came with those tranny`s ( 3500 series )